THE RESISTANCE OF THE HOUSE-FLY (MUSCA-DO MESTICA) TO ORGANOPHOSPHATES IN THE KOSICE DISTRICT, SLOVAK-REPUBLIC

We tested resistance to the organophosphates in the wild population of house fly from 9 (1991) and 15 (1992) farms of of the Kosice region. A considerable high percentage (13 - 100 %) of resistant females prese nt in the populations, was found in 1991, when fenithrothion and pirim iphos-methyl was used for a long time. When these compounds were no mo re used for the control of fly, the percentage of resistant females in the population decreased to 10 - 23 % in 1992. We would like to indic ate on demand for organization the planary monitoring of resistance de velopment of house fly to insecticides in animal houses. In view of an imal production economy and the ecological consequences of ineffective control due to resistance of house fly to insecticides, increased att ention of the veterinary service as well as all other bodies concerned in animal production is required.